SCA#3 Most missed topics

Which statement best describes an element?

• pure, made of more than one type of atom

• when combined, a chemical reaction forms

• pure, made of only one type of atom

• can be broken down easily

Which one can be found on the periodic table?

• Compound 
• Element

Which one has more than one type of atom in it?

• Element
• Compound 

Helium (He) is an example of an:

• Element

• Compound

• Solution

• Mixture

When two or more different elements chemically combine, a __________________________ is formed.

• element

• compound

• mixture

• solution

Examples are water (H₂O) and carbon dioxide (CO₂).

• elements

• compounds

This picture represents which of the following?

• element

• compound

• Element
• Compound

Which of the following represents an element?

• H₂O
• H₂
• NaCl
• CaCO₃

_____________ ______________ are things you can observe and describe about matter without it changing chemically.

• Chemical properties

• Luster

• Physical properites

• Ductile